Modified polytrimethylene terephthalate
AssigneeAsahi Kasei Kabushiki Kaisha
InventorsJinichiro Kato, Tetsuko Takahashi, Shinichi Okajima, Katsuhiro Fujimoto, Kenji Imura
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Abstract
The present invention provides poly(trimethylene terephthalate) copolymerized with ester-forming sulfonate and a fiber thereof. The polymer of the present invention is high in melting point, small in loss of melting viscosity and has a high molecular weight. The fiber of the present invention is high in toughness, excellent in whiteness and dyeable with a cationic dye, whereby it is useful for clothing, carpets or non-woven sheets, etc.
Claims20
A poly(trimethylene terephthalate) copolymer characterized in that it satisfies the following conditions (1) to (4):
- (1) ester-forming sulfonate in a range from 0.5 to 5 mol % is copolymerized relative to a total dicarbonic acid component;
- (2) bis (3-hydroxypropyl) ether in a range from 0.1 to 2.5 wt % is copolymerized;
- (3) an intrinsic viscosity is in a range from 0.65 to 1.5 dl/g, and
- (4) an amount of terminal carboxyl groups is 25 milli-equivalent per kg resin or less.
A method for producing a poly(trimethylene terephthalate) copolymer characterized in that the method comprises the steps of:
- reacting lower alcohol ester of terephthalic acid, which is a main dicarboxylic acid component, with 1,3-propanediol, which is a main diol component, to form 1,3-propanediol ester of terephthalic acid and/or oligomer thereof;
- after completing the polycondensation reaction, once solidifying the resultant polymer;
- and heating the polymer in a solid state to increase an intrinsic viscosity thereof by 0.1 dl/g or more from that at a time when the polycondensation reaction has completed, and the method satisfies the following conditions (a) and (b):
- (a) ester-forming sulfonate corresponding to an amount in a range from 0.5 to 5 mol % of a total dicarboxylic acid component is added at any optional stage from the initiation of reaction to the completion of the polycondensation reaction, and
- (b) an amount of terminal carboxyl groups of poly(trimethylene terephthalate) copolymer is in a range from 5 to 40 milli-equivalent per kg resin before the initiation of solid-state polymerization.
A method for producing a poly(trimethylene terephthalate) copolymer characterized in that the method comprises the steps of:
- reacting terephthalic acid, which is a main dicarboxylic acid component, with 1,3-propanediol, which is a main diol component, to form 1,3-propanediol ester of terephthalic acid and/or oligomer thereof;
- after completing the polycondensation reaction, solidifying the resultant polymer;
- and heating the polymer in a solid state to increase an intrinsic viscosity thereof by 0.1 dl/g or more from that at a time when the polycondensation reaction has completed, and the method satisfies the following conditions (a) to (c):
- (a) the molar ratio of 1,3-propanediol to terephthalic acid is in a range from 0.8 to 2.5,
- (b) in the reaction of terephthalic acid with diol mainly composed of 1,3-propanediol, at a stage wherein a rate of reaction of terephthalic acid is in a range from 75 to 100%, an amount of ester-forming sulfonate corresponding to a range from 0.5 to 5 mol % of total dicarboxylic acid component is added, and
- (c) the amount of terminal carboxyl groups of poly(trimethylene terephthalate) copolymer is in a range from 5 to 40 milli-equivalent per kg resin before the initiation of solid-state polymerization.
A method for producing a poly(trimethylene terephthalate) copolymer comprising the steps of:
- by reacting terephthalic acid, which is a main dicarboxylic acid component, with 1,3-propanediol, which is a main diol component, to form 1,3-propanediol ester of terephthalic acid and/or oligomer thereof;
- after completing the polycondensation reaction, characterized in that the method satisfies the following conditions (a) to (c):
- (a) a molar ratio of 1,3-propanediol to terephthalic acid is in a range from 0.8 to 2.5,
- (b) in the reaction of terephthalic acid with diol mainly composed of 1,3-propanediol, at a stage wherein a rate of reaction of terephthalic acid is in a range from 75 to 100%, an amount of ester-forming sulfonate corresponding to a range from 0.5 to 5 mol % of total dicarboxylic acid component is added, and
- (c) an amount of terminal carboxyl groups of poly(trimethylene terephthalate) copolymer is in a range from 5 to 40 milli-equivalent per kg resin.
A poly(trimethylene terephthalate) copolymer fiber characterized in that it satisfies the following conditions (1) to (4):
- (1) ester-forming sulfonate in a range from 0.5 to 5 mol % is copolymerized relative to a total dicarboxylic acid component;
- (2) bis (3-hydroxypropyl) ether in a range from 0.1 to 2.5 wt % is copolymerized;
- (3) an intrinsic viscosity is in a range from 0.65 to 1.5 dl/g, and
- (4) an amount of terminal carboxyl groups is in a range from 5 to 40 milli-equivalent per kg fiber or less.
A poly(trimethylene terephthalate) copolymer fiber characterized in that ester-forming sulfonate in a range from 0.5 to 5 mol % is copolymerized relative to a total dicarboxylic acid component, and the fiber satisfies the following conditions (A) to (C):
- (A) an intrinsic viscosity [η] is in a range from 0.65 to 1.4 dl/g,
- (B) a peak temperature of a dynamic loss tangent is in a range from 105 to 140° C., and
- (C) a boiling water shrinkage is in a range from 0 to 16%.
An undrawn poly(trimethylene terephthalate) copolymer fiber characterized in that it consists of poly(trimethylene terephthalate) formed by copolymerizing ester-forming sulfonate in a range from 0.5 to 5 mol % to a total dicarboxylic acid component to have an intrinsic viscosity in a range from 0.65 to 1.4 dl/g, and it has an elongation at break in a range from 150 to 600% and a crystallization peak temperature in a range from 64 to 80° C.
A method for producing a poly(trimethylene terephthalate) copolymer fiber characterized in that an undrawn poly(trimethylene terephthalate) copolymer fiber, having an elongation at break in a range from 150 to 600% and a crystallization peak temperature in a range from 64 to 80° C., is drawn at a draw ratio in a range from 30 to 99% of the maximum draw ratio, and the undrawn poly(trimethylene terephthalate) copolymer fiber consists of poly(trimethylene terephthalate) formed by copolymerizing ester-forming sulfonate in a range from 0.5 to 5 mol % to a total dicarboxylic acid component to have an intrinsic viscosity in a range from 0.65 to 1.5 dl/g.
A method for producing a poly(trimethylene terephthalate) copolymer fiber characterized in that the poly(trimethylene terephthalate) is formed by copolymerizing ester-forming sulfonate in a range from 0.5 to 5 mol % to a total dicarboxylic acid component to have an intrinsic viscosity in a range from 0.65 to 1.5 dl/g, the poly(trimethylene terephthalate) is extruded from a spinneret having a surface temperature in a range from 250 to 295° C. and, after being cooled and solidified, is taken up at a speed in a range from 100 to 3,000 m/min to be an undrawn yarn which is then drawn at a temperature in a range from 30 to 90° C. and a draw ratio which is in a range from 30 to 99% of the maximum draw ratio, and then a drawn fiber obtained is heat-treated at a temperature from 100 to 200° C.
Dependencies are inferred from the claim text.